1377216225 has 72 divisors (see below), whose sum is σ = 3075463872. Its totient is φ = 572342400.

The previous prime is 1377216221. The next prime is 1377216227. The reversal of 1377216225 is 5226127731.

1377216225 is a `hidden beast` number, since 1 + 3 + 7 + 7 + 21 + 622 + 5 = 666.

It is not a de Polignac number, because 1377216225 - 2² = 1377216221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1377216225.

It is not an unprimeable number, because it can be changed into a prime (1377216221) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 22422 + ... + 57071.

It is an arithmetic number, because the mean of its divisors is an integer number (42714776).

Almost surely, 2^1377216225 is an apocalyptic number.

1377216225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1377216225 is an abundant number, since it is smaller than the sum of its proper divisors (1698247647).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1377216225 is a wasteful number, since it uses less digits than its factorization.

1377216225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79527 (or 79519 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 1377216225 is about 37110.8639753914. The cubic root of 1377216225 is about 1112.5871597748.

The spelling of 1377216225 in words is "one billion, three hundred seventy-seven million, two hundred sixteen thousand, two hundred twenty-five".